How to display a User defined symbol when using addLinearFeature

Question

Hi ,
We are displaying our DataBase spatial data in the form of image on to the browser .
With the help of MapViewer mv.addLinearFeature i am able to draw lines on to it .
I have created styles in MapBuilder for our userdefined symbols and added to Mapviewerconfig file .
Now as per our requirement we need to put our user defined symbols in the middle of the line when a line is drawn using addLinearFeature
For example Like This :
Assume that (::) this is our symbol .
Please tell me how to do this .

Answer 1

You could use the marker (user defined symbol) as a label for the line. Something like the highways theme/style definition in the mvdemo example where the highway shield is a marker.
SQL> select styling_rules from user_sdo_themes where name='THEME_DEMO_HIGHWAYS';
STYLING_RULES
<?xml version="1.0" standalone="yes"?>
<styling_rules >
<rule >
<features style="L.PH"> </features>
<label column="ROUTEN" style="M.SHIELD1"> 1 </label>
</rule>
</styling_rules>
SQL> select definition from user_sdo_styles where name='M.SHIELD1';
DEFINITION
<?xml version="1.0" standalone="yes"?>
<svg width="1in" height="1in">
<desc></desc>
<g class="marker" style="width:20;height:18;font-family:sansserif;font-size:9pt
;fill:#ffffff;text-style:[t.shield1]">
<image x="0" y="0" width="9999" height="9999" type="gif" href="dummy.gif"/></g>
</svg>
SQL>
The content of ROUTEN (column/attribute) is displayed in the marker (m.shield1).
Will something similar work or is your requirement different?
If its to simply display a marker (i.e. your user defined symbol which is in the database user_sdo_styles view) somewhere along the line then use a line style definition like (see Appendix A of the user guide):
<?xml version="1.0" standalone="yes"?>
<svg width="1in" height="1in">
<g class="line" style="fill:#33a9ff;stroke-width:4;
marker-name:M.IMAGE105_BW;marker-position:0.15;marker-size=8">
<line class="parallel" style="fill:red;stroke-width:1.0"/>
</g>
</svg>
This will display the marker M.IMAGE105_BW at about 0.15th of the line length.
If you want that marker repeated at fixed intervals (0.15 of line length in the following) then use
<?xml version="1.0" standalone="yes"?>
<svg width="1in" height="1in">
<g class="line" style="fill:#33a9ff;stroke-width:4;
marker-name:M.IMAGE105_BW;marker-position:0.15;marker-size=8;multiple-marker=true">
<line class="parallel" style="fill:red;stroke-width:1.0"/>
</g>
</svg>